64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
#ifndef _MATH_H
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#define _MATH_H
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#define M_PI 3.141592653589793
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#ifndef _MATH_INLINE
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#define _MATH_INLINE static inline
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#endif
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extern inline float sqrtf(float x)
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{
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volatile float y;
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if(x > 0.0f)
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{
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double guess = __frsqrte((double)x); // returns an approximation to
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guess = 0.5*guess*(3.0 - guess*guess*x); // now have 12 sig bits
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guess = 0.5*guess*(3.0 - guess*guess*x); // now have 24 sig bits
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guess = 0.5*guess*(3.0 - guess*guess*x); // now have 32 sig bits
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y=(float)(x*guess);
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return y;
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}
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return x;
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}
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double atan(double x);
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double copysign(double x, double y);
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double cos(double x);
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double floor(double x);
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double frexp(double x, int *exp);
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double ldexp(double x, int exp);
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double modf(double x, double *intpart);
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double sin(double x);
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double tan(double x);
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double acos(double x);
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double asin(double x);
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double atan2(double y, double x);
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double fmod(double x, double y);
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double log(double x);
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double pow(double x, double y);
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float tanf(float x);
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float sinf(float x);
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float cosf(float x);
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float atan2f(float y, float x);
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float acosf(float x);
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extern inline double fabs(double x)
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{
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return __fabs(x);
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}
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_MATH_INLINE float fabsf(float x) { return (float)fabs((double)x); }
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_MATH_INLINE float sinf(float x) { return (float)sin((double)x); }
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_MATH_INLINE float cosf(float x) { return (float)cos((double)x); }
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_MATH_INLINE float atan2f(float y, float x) { return (float)atan2((double)y, (double)x); }
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_MATH_INLINE float atanf(float x) { return (float)atan((double)x); }
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_MATH_INLINE float asinf(float x) { return (float)asin((double)x); }
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_MATH_INLINE float fmodf(float x, float m) { return (float)fmod((double)x, (double)m); }
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_MATH_INLINE float floorf(float x) { return floor(x); }
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_MATH_INLINE float powf(float __x, float __y) { return pow(__x, __y); }
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#endif
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